From: Pali Rohár Date: Fri, 20 Sep 2024 23:29:33 +0000 (+0200) Subject: cifs: Validate content of WSL reparse point buffers X-Git-Tag: v6.12.20~88 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b2bccc729b933a9f0f982ee05f7cf0c59a32311b;p=thirdparty%2Fkernel%2Fstable.git cifs: Validate content of WSL reparse point buffers [ Upstream commit 1f48660667efb97c3cf70485c7e1977af718b48b ] WSL socket, fifo, char and block devices have empty reparse buffer. Validate the length of the reparse buffer. Signed-off-by: Pali Rohár Signed-off-by: Steve French Stable-dep-of: cad3fc0a4c8c ("cifs: Throw -EOPNOTSUPP error on unsupported reparse point type from parse_reparse_point()") Signed-off-by: Sasha Levin --- diff --git a/fs/smb/client/reparse.c b/fs/smb/client/reparse.c index e56a8df23fec9..bd8808e50d127 100644 --- a/fs/smb/client/reparse.c +++ b/fs/smb/client/reparse.c @@ -651,6 +651,11 @@ int parse_reparse_point(struct reparse_data_buffer *buf, case IO_REPARSE_TAG_LX_FIFO: case IO_REPARSE_TAG_LX_CHR: case IO_REPARSE_TAG_LX_BLK: + if (le16_to_cpu(buf->ReparseDataLength) != 0) { + cifs_dbg(VFS, "srv returned malformed buffer for reparse point: 0x%08x\n", + le32_to_cpu(buf->ReparseTag)); + return -EIO; + } break; default: cifs_tcon_dbg(VFS | ONCE, "unhandled reparse tag: 0x%08x\n",